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© Jean-François M.
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© NASA/Goddard/University of Arizona/CSA/York/MDA via APThis undated image made available by NASA shows the asteroid Bennu from the OSIRIS-REx spacecraft. On Wednesday, Aug. 11, 2021, scientists said they have a better handle on asteroid Bennu’s whereabouts for the next 200 years. The bad news is that the space rock has a slightly greater chance of clobbering Earth than previously thought. But don’t be alarmed: Scientists reported that the odds are still quite low that Bennu will hit us in the next century.
Bennu is a Near-Earth Object (NEO) that passes by the planet roughly every six years, and experts have been watching it since it was discovered in September 1999.
According to scientists, Bennu has a chance to pass through what they call a "gravity keyhole," which would send it on a collision course with Earth in the year 2182.
A new paper from the OSIRIS-REx science team predicts Bennu has a 0.037% chance (1 in 2,700) of hitting Earth; this will largely depend on another flyby. In 2135, Bennu will zoom past Earth just close enough that our planet's gravitational pull could affect it in just the right way to put it on a path to hit us on Sept. 24, 2182 — almost 159 years to the day from this writing.
But future missions, scientists say, are safe from both rare lightning strikes and meteors known to burn up high above the planet's clouds.
The thick, acid-rich clouds of Venus continue to shroud the planet next door in mystery.
Scientists have long-debated whether intriguing light flashes recorded by previous Venus missions are evidence of lightning strikes on the planet. If those flashes really represent lightning, future missions to the windy planet need to be designed such that they are strong enough to survive the bolts, which are known to damage electronics here on Earth.
Moreover, lightning on Venus means Earth's cosmic neighbor would join the rare planetary club whose current members — Earth, Jupiter and Saturn — host lightning bolts in their clouds. Such flickers of light would also be unique on the world in that they'd exist despite Venus' clouds lacking water, a substance considered key in creating electrical charges.
So, scientists are excited by the possibility of lightning on Venus — but the evidence so far has been circumstantial at best.
And now, a new study suggests lightning might be extremely rare on the planet. Instead, it offers the possibility that meteors burning up high in Venus' atmosphere are very likely responsible for the detected light flashes.
© FutureVenus as clicked by the Akatsuki orbiter in March 2018.
Scientists have long-debated whether intriguing light flashes recorded by previous Venus missions are evidence of lightning strikes on the planet. If those flashes really represent lightning, future missions to the windy planet need to be designed such that they are strong enough to survive the bolts, which are known to damage electronics here on Earth.
Moreover, lightning on Venus means Earth's cosmic neighbor would join the rare planetary club whose current members — Earth, Jupiter and Saturn — host lightning bolts in their clouds. Such flickers of light would also be unique on the world in that they'd exist despite Venus' clouds lacking water, a substance considered key in creating electrical charges.
So, scientists are excited by the possibility of lightning on Venus — but the evidence so far has been circumstantial at best.
And now, a new study suggests lightning might be extremely rare on the planet. Instead, it offers the possibility that meteors burning up high in Venus' atmosphere are very likely responsible for the detected light flashes.
This flash one of the brightest ever recorded on the giant gas planet, was observed last month.
An amateur Japanese astronomer Tadao Ohsugi spotted a bright flash in Jupiter's atmosphere. This flash one of the brightest ever recorded on the giant gas planet, was observed last month.
According to a New York Times report, the astronomer sent an email to Dr. Ko Arimatsu, an astronomer at Kyoto University. Upon receiving the email, Dr. Arimatsu put a call out for more information. The media report said that flashes like these are caused by asteroids or comets from the edges of our solar system that impact Jupiter's atmosphere.
Dr. Arimatsu received six more reports of the August 28 flash. Dr. Arimatsu told NYT, "Direct observation of these bodies is virtually impossible, even with advanced telescopes," Dr. Arimatsu wrote in an email. But Jupiter's gravity lures in these objects, which eventually slam into the planet, "making it a unique and invaluable tool for studying them directly."
© Tweeted by @theshantanumumFlashes like these are caused by asteroids or comets.
According to a New York Times report, the astronomer sent an email to Dr. Ko Arimatsu, an astronomer at Kyoto University. Upon receiving the email, Dr. Arimatsu put a call out for more information. The media report said that flashes like these are caused by asteroids or comets from the edges of our solar system that impact Jupiter's atmosphere.
Dr. Arimatsu received six more reports of the August 28 flash. Dr. Arimatsu told NYT, "Direct observation of these bodies is virtually impossible, even with advanced telescopes," Dr. Arimatsu wrote in an email. But Jupiter's gravity lures in these objects, which eventually slam into the planet, "making it a unique and invaluable tool for studying them directly."
© Patrick R
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